廬
Features
64 bit memory array laser programmable
Wide dynamic range due to on chip buffer
capacitance & voltage limiter on chip.
Full wave rectifier on chip
Big modulation depth due to a low impedance
modulation device
50'000 baud reading speed at 3 MHz
Very small chip size convenient for implantation
Unsensitive close to metal
Large distance even without resonance capacitor
No external buffer capacitance needed due to low
power consumption
EM MICROELECTRONIC-MARIN SA
H4001
READ-ONLY CONTACTLESS
IDENTIFICATION DEVICE
Typical Operating Configuration
COIL 1
L
C
H4001
COIL 2
Description
The H4001 is a CMOS integrated circuit for use in
transponders. The circuit is powered by an external
coil placed in a magnetic field, and gets its clock from
the same field via one of the coil terminals. The other
coil terminal is affected by the modulator, turning on
and off the modulation current in order to send back
the 64 bits of information contained in a factory
pre-programmed memory array.
The programming of the chip is performed by laser
fusing of polysilicon links in order to store a unique
code on each chip.
The serial output data string contains a 9 bits header,
40 bits of data, 14 parity bits, and 1 stop bit.
COIL 2
Typical value of inductance at 125 KHz is 2 mH
The capacitor is adjusted to the resonance
Fig. 1
Pin Assignment
Due to the low power consumption of the logic core,
no supply buffer capacitor is required. Only an external
coil is required to obtain the chip function. A parallel
capacitor adjusted with the coil to obtain resonnance,
will increase the read distance.
COIL 1
Applications
Industrial transponder
Animal transponder
ID Cards
Serial Number Identification ROM
COIL 1
COIL 2
coil terminal/ clock input
coil terminal/ data transmisssion
Fig. 2
1
1
2
3
4
5
